Step 1: Finish making Avengers: Infinity War. Step 2: Go on a press junket where you promote the film with a knock-off version of The Brady Bunch theme. That’s what the movie cast did on Jimmy Kimmel Live with Robert Downey Jr, Scarlett Johansson, Chris Pratt, Chris Evans, Chadwick Boseman, and more. Also, who knew Chris Pratt could sing?